The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 11, 1995
Filed:
Aug. 25, 1993
Applicant:
Inventors:
Tadakatsu Shimada, Gunma, JP;
Kazuo Koya, Gunma, JP;
Assignee:
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
356 731 ; 356239 ; 356426 ;
Abstract
A method and an apparatus for accurately, thoroughly and automatically inspecting an optical fiber preform for the presence of bubbles and/or inclusions are herein provided. The inspection apparatus comprises light source 2 for making light rays incident upon the end face 1a of rod-like optical fiber preform 1 as a subject to be inspected, video camera 7 for photographing the side face of the optical fiber preform 1 and image-processing circuit 11 for discriminating and detecting bubbles and/or inclusions present in the preform 1 through processing of image signals outputted from the video camera 7 and inputted to the circuit 11.